Big Meks with KFF are very useful. That one Battlewagon is going to need a great deal of help to get across the field; every heavy weapon your opponent has will be trained on it - unless your opponents are nit-wits.
I would diversify your Nobs to get the benefit of wound allocation. My Bully Boys squads are equipped thusly: Power Klaw (PK) and Boss Pole, PK, Waagh! Banner, Big Choppa, Rokkit combi, Scorcha combi, Twin-linked shoota, Boss pole, and a Pain boy. One has no upgrades. All have Cyborg bodies. This is about the cheapest way go to achieve full diversity with two Klaws. One more Klaw wouldn't hurt, but these guys run with a Warboss and I use three such units.
The point of the equipment is to have ten separate groups to assign wounds to. In theory, it could take elven wounds to result in one casualty. In practice, the cheap guys take a disproportionate number of wounds and usually bite it first, before the Klaw guys ever see a wound. With Feel-no-pain and Cyborg bodies, these are really tough units. They can eat most units for breakfast, lunch, and dinner without breaking a sweat.
Stompas are big fun, but a KFF makes them super fun - well, fun for the Ork player, opponents hate it. It takes forever to destroy a Stompa with KFF protection. I usually use at least one of mine as the "Big Dred" in an Apocalypse Dred Mob formation. Next time out, both will be used that way since I've finally got enough Kans and Dreds to field two of the formations.
Having a Mek on board isn't a bad thing for a Stompa either. I sometimes use a squad of five Burnas with three Mek upgrades as Stompa riders. They can fix up things like destroyed weapons or damaged drives.
I like the Green Tide formation with Grotsnik or an IA:8 Pain Boss as well as a KFF Mek, but at 3,000 it would be hard to fit in.
Be sure to keep Thunder Hammer Terminators away from your Stompas, and don't even think about letting Lysander near one.
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